The password management service LastPass has been hacked and users are advised to change their master passwords as soon as possible.
This was announced on June 15 2015 where they stated that they discovered and blocked the suspicious activity on Friday. LastPass also added that they are confident about their encryption measures,
"We are confident that our encryption measures are sufficient to protect the vast majority of users. LastPass strengthens the authentication hash with a random salt and 100,000 rounds of server-side PBKDF2-SHA256, in addition to the rounds performed client-side. This additional strengthening makes it difficult to attack the stolen hashes with any significant speed."

LastPass is also sending emails to all their users to all their users regarding the incident.One good news is that encrypted user data was not stolen and users do not have to change their passwords on sites stored in their LastPass vault.